Wilhelm lorenz



(No Model.)

W. LORENZ. LANCE.

No. 417,433. Patented Dec. 17, 1889.

I N. FEYERS, Phvln-Ulhngnpher. washing-m m1 UNITED STATES PATENT OFFICE.

IVILI-IELM LORENZ, OF CARLSRUHE, B ADEN, GERMANY.

LANCE.

SPECIFICATION forming part of Letters Patent No. 417,433, dated December 17, 1889.

Application filed March 2, 1889- Serial No. 301,751- (No model.)

have invented a certain new and useful Improvement in Lances, of which the following is a specification.

The highly-effective weapons known as lances have been before made with tubular metal shafts, the shafts being variously conditioned with regard to their attachment to the heads and with regard totaper, being sometimes in one piece and sometimes in two or more pieces. I can correspondingly vary the conditions. My improved lance has a hollow metal shaft, and may be made, like corresponding shafts before known, of uniform size throughout, or tapered one way or tapered both ways in one piece or in many pieces. I have discovered that the shafts may be greatly stiffened and lightened by producing them with longitudinal corruga tions extending along the whole or a part of their lengths. These corrugations, by which .I meanv ridges and grooves extending lengthwise along the shaft, may be produced by drawing, pressing, rolling, or in any other convenient way. They may be produced by casting the ingot or metal mass with such corrugations and afterward using the metal in the same form as it is cast, or variously modified by rolling, drawing, stamping, pressing, &c.; or the metal may be cast or otherwise shaped as a plain cylindrical tube and be subsequently treated to produce the corrugations.

The accompanying drawings form a part of this specification, and represent what I consider the best forms for carrying out the invention.

Figure 1 is a lance having a shaft of uniform size throughout, except that it is contracted near each end. Figs. 2 to 10, inclusive, are modifications. All these are side elevations. Figs. 11, 12, and 13 are cross-sections on a larger scale. Fig. 13 corresponds to Fig. 1. The other figures are modifications having a less number of corrugations.

Similar letters of reference indicate corresponding parts in all the figures where they occur.

A is the head of the lance, and B is the hollow shaft thereof. Certain portions of the latter are. designated in the sectional views by supernumerals, as B B The corrugations are thus marked 13, indicating the ridges on the exterior, and B indicating the grooves in the exterior. It will be observed that the form of the interior corresponds with that of the exterior. The metal is of nearly equal thickness throughout.

In whatI esteem a very useful modification (shown in Fig. the corrugations are arranged helicoidally. Such corrugations may give very desirable elasticity. The corrugations may grow less toward the center or toward the ends. a portion, as in Fig. 2 and several others. There may be other variations than those shown.

I claim as my invention A lance-shaft in tubular form, made stiff and elastic by corrugations B B extending longitudinally and provided with a head A, as herein specified.

In testimony whereof I have hereunto set my hand, at Carlsruhe, this th day of J anuary,1889,in the presence of two subscribing witnesses.

WILHELM LORENZ.

IVitnesses:

FRIEDRICH LORCH, ADOLF LEHNE.

5 They may extend only along 

